globalist Posted September 10, 2014 Share Posted September 10, 2014 So my Gigabyte P55a-UD4 (with an i5 CPU) has died and I've got it replaced with a P55-UD3R, upgrading to an i7 CPU along the way. I did not reinstall the OS as I would lose too many settings accumulated over the years, and it wasn't even necessary - the previous OS booted fine on the new mobo.All the other components remain the same as well, but now there's an issue - weird noise coming from the mobo. I know it is the mobo because I have swapped out all the other components and it didn't make a difference.Now the weird part - the noise is only present once booted into my Win7 x64. I've tried Ubuntu Live and the mobo was quiet. I've also accidentally used Acronis Universal Restore (which disabled/replaced a bunch of drivers in my OS, making it not really usable and I had to restore to a previous backup) upon which my Windows booted up and the mobo was quiet again.I thought it could be some capacitors on the mobo, but now I'm leaning more towards a software issue.Can anyone help me troubleshoot this? Many thanks! Link to comment Share on other sites More sharing options...
vcfan Posted September 10, 2014 Share Posted September 10, 2014 could be coil whine from the cpu PS on the mobo. Link to comment Share on other sites More sharing options...
globalist Posted September 10, 2014 Author Share Posted September 10, 2014 Update: the noise is only present when the CPU is in low-power state.If I do this (as per a tomshardware thread I found on this issue):1. Execute: "regedit"2 .Locate: HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Control \ Power \ PowerSettings \ 54533251-82be-4824-96c1-47b60b?740d00 \ 5d76a2ca-e8c0-402f-a133-215849?2d58ad3. Change Attributes from 1 to 0.4. Then, through the control panel - power options - "processor idle disable".The noise is gone but the CPU is not "downclocking/downvolting".Any ideas? Link to comment Share on other sites More sharing options...
globalist Posted September 11, 2014 Author Share Posted September 11, 2014 I disabled C3/C6 power state in BIOS and it solved the issue, without affecting my CPU's ability to enter low-power state. Weird. Link to comment Share on other sites More sharing options...
+PeterUK MVC Posted September 11, 2014 MVC Share Posted September 11, 2014 I disabled C3/C6 power state in BIOS and it solved the issue, without affecting my CPU's ability to enter low-power state. Weird. But it will affect the CPU doing turbo boost correctly. Link to comment Share on other sites More sharing options...
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